Center of MassHard
Question
A mass of 0.2 kg moving with a speed of 2m/s strikes a horizontal spring and is brough to rest after compressing the spring by 2cm. If g = 10m/s2, then the spring constant should be :-
Options
A.2000 
B.20,000
C.1000
D.40,000
Solution
By conservation of mechanical energy
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